netdev - Re: [Bug #15042] socket(PF_INET6 hangs when ipv6 not yet initialized

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Message-ID: <20100214062015.GA16912@torres.zugschlus.de>
Date:	Sun, 14 Feb 2010 07:20:15 +0100
From:	Marc Haber <mh+linux-kernel-bugs@...schlus.de>
To:	Américo Wang <xiyou.wangcong@...il.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [Bug #15042] socket(PF_INET6 hangs when ipv6 not yet
	initialized

Hi,

sorry for the late reply.

On Wed, Jan 27, 2010 at 05:10:44PM +0800, Américo Wang wrote:
> On Mon, Jan 25, 2010 at 6:23 AM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> > This message has been generated automatically as a part of a report
> > of regressions introduced between 2.6.31 and 2.6.32.
> >
> > The following bug entry is on the current list of known regressions
> > introduced between 2.6.31 and 2.6.32.  Please verify if it still should
> > be listed and let me know (either way).
> >
> >
> > Bug-Entry       : http://bugzilla.kernel.org/show_bug.cgi?id=15042
> > Subject         : socket(PF_INET6 hangs when ipv6 not yet initialized
> > Submitter       : Marc Haber <mh+linux-kernel@...schlus.de>
> > Date            : 2010-01-10 14:28 (15 days old)
> > References      : http://marc.info/?l=linux-kernel&m=126313553029280&w=4
> >
> 
> (Adding net-dev into Cc)
> 
> Hi, Marc,
> 
> Sorry, I don't really understand your description of the problem, your mean
> your ssh hangs on socket PF_INET6 for 30 seconds?

No, it hangs on socket PF_INET6 indefinetely (max time I waited was
like ten minutes), ignoring SIGTERM while hanging. This does only
happen if the sshd is started within seconds of the ipv6 module being
loaded (or the Interface being brought up), so I guess that the kernel
needs to be in a state where it already thinks that it has IPv6 but
hasn't completed autoconfiguration yet.

To obtain an strace, I had to use timeout --signal=9 30. The
virtualbox process this happens inside takes all host CPU while the
ssh process hangs.

> Have you enabled CONFIG_DETECT_SOFTLOCKUP for your kernel?

yes, that's enabled.

Greetings
Marc

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